Hi,
We migrated a mail server from qmail + vpopmail to postfix+vpopmail
and the mail server is working properly with virtual domains.
The only problem is that if the user has a .forward file in the home
or in the Maildir doesn't read them and doesn't forward the emails but
delivers them locally.
If you are delivering mail to virtual users with virtual(8), .forward
files do not work.
Only local(8) processes .forward files.
If you need to process .forward files for virtual users, use another MDA.
J.